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KENNEDY SPACE CENTER, FLA. -- Following the successful simulated launch countdown and emergency egress practice, the STS-120 crew gathers for the traditional photo near the top of the fixed service structure. From left are Mission Specialists Scott Parazynski and Stephanie Wilson, Pilot George Zamka, Commander Pamela Melroy, and Mission Specialists Daniel Tani, Doug Wheelock and Paolo Nespoli, who represents the European Space Agency. The countdown was the culmination of the prelaunch terminal countdown demonstration test, or TCDT. The TCDT at NASA's Kennedy Space Center provides astronauts and ground crews an opportunity to participate in various launch preparation activities, including equipment familiarization and emergency training. The STS-120 mission will deliver the U.S. Node 2 module, named Harmony, aboard space shuttle Discovery to the International Space Station. Discovery is targeted to launch on its 14-day mission at 11:38 a.m. EDT on Oct. 23. Photo credit: NASA/Kim Shiflett